Is This Really Okay for an Idol? [Crossover]

Content warnings: Parallel worlds, a selfcest premise, and a high concentration of x-England in the first half. Ever since Zhinian Zhensu realized that his life script wasn't Ranma 1/2, but Your Name (not really), his life had been turned upside down! For example, getting a temporary student ID at a hero-training high school in a neighboring world; for example, becoming a part-time clerk at a Yokohama detective agency; and for example... Huh? Why is my identity getting more and more complicated? I'm just an idol, aaah! Notes: 1. Original male lead. The male and female leads are each other's parallel-world selves, but they are not the same person in essence. 2. I've mashed up and eaten the timeline. 3. The ending is being updated slowly. Theme: